import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int[] arr = new int [5];
		String str = null;
		while(sc.hasNext()){
			String choice = sc.next();
			
			try{
				if (choice.equals("arr")){
					int i = sc.nextInt();
					arr[i] = 1;
				}
				else if(choice.equals("null")){
					str.length();
				}
				else if(choice.equals("cast")){
					Object o = new String("str");
					Integer x = (Integer)o;
				}
				else if(choice.equals("num")){
					String intNum = sc.next();
					Integer.parseInt(intNum);
				}
				else{
					break;
				}
			}catch (Exception e){
				System.out.println(e);
			}
		}
		

	}

}
